Apply correct transform on webpack config

app/preact/src/server/framework-preset-preact.ts

@@ -18,6 +18,19 @@ export function babelDefault(config: TransformOptions): TransformOptions {
 }
 
 export function webpackFinal(config: Configuration): Configuration {
+  const tsxRule = config.module.rules.find((rule) => (rule.test as RegExp).test?.('main.tsx'));
+  tsxRule.use = (tsxRule.use as any).map((entry: any) => {
+    let newPlugins = entry.options.plugins;
+    if (entry.loader?.includes('babel-loader')) {
+      newPlugins = (entry.options as any).plugins.map((plugin: any) => {
+        if (plugin[0]?.includes?.('@babel/plugin-transform-react-jsx')) {
+          return [plugin[0], { importSource: 'preact', runtime: 'automatic' }];
+        }
+        return plugin;
+      });
+    }
+    return { ...entry, options: { ...entry.options, plugins: newPlugins } };
+  });
   return {
     ...config,
     resolve: {
@@ -27,6 +40,7 @@ export function webpackFinal(config: Configuration): Configuration {
         react: path.dirname(require.resolve('preact/compat/package.json')),
         'react-dom/test-utils': path.dirname(require.resolve('preact/test-utils/package.json')),
         'react-dom': path.dirname(require.resolve('preact/compat/package.json')),
+        'react/jsx-runtime': path.dirname(require.resolve('preact/jsx-runtime/package.json')),
       },
     },
   };